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八年级短语、单词辨析

发布时间:2013-12-28 13:00:32  

八年级短语、单词辨析 1

一)Cross /across /through /pass

都有“横过,穿过 ,越过,经过”意思。Cross 与across 意思相同。Across 是介词,是指从一边到另一边;through 是介词,指从物体中间穿过;pass 指从某地、某物、某人旁面经过。

(1) They built a bridge ______the river .

(2) A blind man is ______ the street .

(3) The Yellew River flows _____nine pronince .

(4) When I was _____ the cinema this morning ,I got two tickets for tonight .

二)Jion /jion in /take part in

Join 是指加入某组织或团体,成为成员之一,如参军,入党等; join in是指参加比赛或活动等,常用于日常口语;take part in 指参加会议或群众性活动等,重在说明句子主语参加该活动并在该活动中发挥作用。

(1) Why didn’t you _____the talk last night ?

(2) My father _____ a revolutionary organization in 1938 .

(3) We often _____physical labour .

(4) My wish is to ____the army after graduation .

三)if /whether

1、if 或whether 引导宾语从句时,作“是否”讲,常放在动词ask ,see ,say ,know 和find out 等后面。一般情况下,两者常可换用,在口语中多用if .

Nobody knows whether (if) it will rain tomorrow .没有人知道明天是否会下雨。

Lucy asked whether (if) they had a sweater .露西问他们是否有毛衣。

2、if 或whether 引导宾语从句时 ,注意三个方面,即连词,语序和时态。

(1)if ,whether 不能和that或其他连词同时使用。

I don’t know if (whether )he will come here today .

He came to see if (whether ) there was wrong with his cat .

(2) if /whether 引导宾语从句,虽具有疑问意义,但从句语序应用陈述句语序。

(3)if /whether 引导宾语从句应和主句的时态一致。即主句为一般现在时从句用任一种时态;主句为一般过去时,从句则用过去时中的任一种时态。

I don’t know if /whether he has come here .

Tom asked if /whether I had read the book .

3, if /whether 的区别

(1)在动词不定式之前只能用whether .

I can’t decide whether to stay .我不能决定是否留下。

(2)whether ----or not 是固定搭配。

I want to know whether it’s good news or not . 我想知道是否是好消息。

(3) 在介词后,只能用whether .

His father is worried about whether he lose his work .他的父亲担心是否会失去工作。

(4)引导主语从句,只能用whether .

Whether they can finish the work on time is still a problem .他们能否准时完成这项工作还是个问题。

(5)用if 会引起歧义时,只用whether .

Could you tell me if you know the answer ?你能告诉我是否知道答案吗?/如果你知道答案,请告诉我,好吗?

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